.quejiaoz {
  width: 100vw;
  height: 100vh;
  background-color: #f2f2f2;
  .nav {
    width: 100vw;
    background-color: #ffffff;
  }
  .card {
    width: 300px;
    height: 180px;
    background-color: #ffffff;
    margin-left: 39px;
  }
  .card3 {
    width: 300px;
    height: 140px;
    background-color: #ffffff;
    margin-left: 39px;
    
  }
  .btn{
    margin-top: 20px;
    width: 330px;
    height: 50px;
    margin-left: 16px;
  }
}
